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New York City's One World Trade Center will top out when crews raise the last two sections of its 408-foot spire today. At a height of 1,776 feet, the tower will become the Western Hemisphere's tallest building.

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A time-lapse video lets viewers see the progress of New York City's One World Trade Center over the last nine years, including the addition of the 408-foot-tall, 758-ton silver spire. The 1,776 foot-high tower, which is slated to be the tallest in Western Hemisphere, is scheduled to be completed next year.

A 67-ton, 408-foot spire was bolted to the top of One World Trade Center this morning, bringing the height of the building to a symbolic 1,776 feet. As of 7:46 a.m., 1 WTC became the tallest building in the Western Hempisphere. "I am very happy, but also sad, because why did we have to rebuild this tower? It's a proud day for the city," said Philip English, a construction worker.

The 22-ton, 408-foot spire of New York City's 1 World Trade Center was hoisted to the top of the tower Thursday. Once the final piece is installed, 1WTC will become the tallest building in the Western Hemisphere at 1,776 feet. Still, resolution of a controversy surrounding the issue of the tower's exact height will depend upon whether the antenna, which is fitted with an LED beacon -- will be considered part of the tower's architectural height.

New York City's One World Trade Center topped out on Monday with the installation of the 408-foot concrete spire's last two sections. At a height of 1,776 feet, the tower will become the Western Hemisphere's tallest building.

Crews installed the 70-ton first section of a 408-foot spire on One World Trade Center in New York City on Tuesday. When complete, the spire will put the total height of the tower at 1,776 feet, making it the tallest skyscraper in the Western Hemisphere. Installation of all 18 pieces of the spire will take about three months.